Malicious PDF — malware analysis report

Static analysis result for SHA-256 129f8755595e9001…

MALICIOUS

PDF

88.4 KB Created: 2021-07-30 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03614a1f9a21845cf6df26eee18826a8 SHA-1: fb46c4300cf77366eb2688480c6ec3abda59cb28 SHA-256: 129f8755595e90015ec0b252dfe0c071dd61e48f9fab2815ea7c52321c9c6ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb43f4e570---pixukedodegifisofa.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95bae042782c0c9d1ce8f3abf8d47ad8/kisetinakabe.pdf
    • http://itkaufmann.com/images/fckimages/file/wowiduzomebinobunoxebaj.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813501d25b7---dowigebuloravasazaj.pdf
    • http://pi-consulting.ch/download/1094364411.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/mijusiga.pdf
    • http://fecoil.com/userfiles/file/47122020901.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff23105cc---zalopomunezo.pdf
    • http://md-servicios.com/userfiles/file/nenugifazonifominesil.pdf
    • https://cubic.is/userfiles/file/lufuxonorumozo.pdf
    • https://scheidungsrecht-best.de/userfiles/file/10664350224.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/45628092756.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c334e1359---47571007814.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5153c817---penagajabaxomelanadog.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae563391754---86434141085.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c5135fcd23062c05e0f7e7ada6ff5d81/zusitupu.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca7001f70---xaweneji.pdf
    • http://www.chatanakonci.cz/userfiles/file/83683689885.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f5d026c8---nujidifumipujosetel.pdf
    • http://mdfgiare.com/upload/files/mumib.pdf
    • http://merwepizza.com/upload/file/sipitiwimoleb.pdf
    • http://web68s.com/upload/files/wukisejurek.pdf
    • http://buergerforum-tirol.at/file/61743537062.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/zavabetesofenu.pdf
    • http://apsons.eu/files/file/tometalekodelujipe.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/wuvipedevuwasu.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/690cbb906447eb38e80e5d08cd2f03e6/bebepikiwufatoruwuno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cuanto+es+un+millon+de+metros+en+kilometros
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
font_01_sfnt_off00010912.bin
8c372c061ec1e9b75af5e3e26eefb33bf0ef4d25c7067b0ebcf2f23a44a6a28d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10632 bytes
font_02_sfnt_off00012161.bin
43728f771a3ae8befdf5a3a5f09b1332af33f073d9fd6ce8b03995d0861d02f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 18644 bytes